Patients receive oral temozolomide on days 1-5, and sargramostim (GM-CSF), interleukin-2, and interferon alfa subcutaneously on days 6-17. Treatment repeats every 28 days for 4-8 courses in the absence of disease progression or unacceptable toxicity. Patients with at least stable or responsive disease after 8 courses of therapy may receive additional therapy at investigators discretion.